This
DNA
exists
as
a
small,
circular,
double
helical
molecule
not
associated
with
histones
and
is
very
similar
to
the
procaryotic
DNA.
The
molecular
weight
of
yeast
mitochondrial
DNA
is
about
I
X
107
daltons.
The
number
of
copies
of
mitochondria
can
be
varied.
In
actively
respiring
yeasts
the
number
can
be
as
high
as
30-50
per
cell
while
under
fermentative
conditions,
they
may
not
be
detectable.
These
mitochondria
contain
a
machinery
for
the
transcription
and
translation
of
the
organelle
specific
DNA.
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